Consolidated Statement Of Income
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | ||||||||||||||
| Statement of income | ||||||||||||||
| Net sales | 
                                                41,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,179,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,221,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,221,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                43,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,027,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,071,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,071,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Operating expenses | ||||||||||||||
| Selling, general and administrative expenses | — | — | 
                                                968,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                950,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                1,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                2,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Provision of allowance for doubtful accounts | — | — | 
                                                -129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cost of sales | — | — | 
                                                5,698,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                5,708,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Operating expenses | ||||||||||||||
| Operating expenses - general | ||||||||||||||
| Remuneration for directors (and other officers) | — | — | 
                                                139,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                121,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Operating expenses | ||||||||||||||
| Operating expenses | ||||||||||||||
| Other operating expenses | ||||||||||||||
| Ordinary expenses | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Interest expenses | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Interest expenses on bonds | — | — | 
                                                1,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Gross profit (loss) | — | — | 
                                                1,523,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,362,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net sales | ||||||||||||||
| Operating profit (loss) | 
                                                19,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                584,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                555,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                604,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                18,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                446,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                464,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                412,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | 
                                                610,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                467,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| General and administrative expenses | ||||||||||||||
| Salaries | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Operating expenses | ||||||||||||||
| Research and development expenses | — | — | 
                                                4,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                4,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Non-operating income | ||||||||||||||
| Interest income | — | — | 
                                                162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                51,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend income | — | — | 
                                                107,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                75,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other | — | — | 
                                                4,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                29,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Non-operating income | — | — | 
                                                112,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                115,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cost of sales | ||||||||||||||
| Extraordinary income | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                41,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Selling, general and administrative expenses | ||||||||||||||
| Salaries | — | — | 
                                                337,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                342,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Extraordinary losses | — | — | 
                                                9,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                8,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Non-operating expenses | ||||||||||||||
| Interest expenses | — | — | 
                                                1,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Amortization of bond issuance costs | — | — | 
                                                1,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other | — | — | 
                                                5,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                19,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Non-operating expenses | — | — | 
                                                57,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                60,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) before income taxes | — | — | 
                                                601,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                500,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Gross profit | ||||||||||||||
| Extraordinary income | ||||||||||||||
| Gain on sale of investment securities | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                41,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes - current | — | — | 
                                                195,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                156,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Extraordinary losses | ||||||||||||||
| Loss on retirement of non-current assets | — | — | 
                                                9,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                8,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes - deferred | — | — | 
                                                -5,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                5,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes | — | — | 
                                                189,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                162,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | — | — | 
                                                411,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                411,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                411,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                411,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                337,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                337,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |